Magnetite-impregnated biochar of parthenium hysterophorus for adsorption of Cr(VI) from tannery industrial wastewater

Abstract The tannery industry inevitably generates toxic and catastrophic wastewater, which results in a huge threat to public health water resources. Therefore, this work aimed synthesize parthenium hysterophorus-based biochar–Fe 3 O 4 composite for removal of Cr(VI) from wastewater under full factorial experimental designs the Box–Behnken, was analyzed using response surface methodology four independent factors pH (3, 6, 9), initial concentrations (40, 70, 100 mg/L), contact times (30, 60, 90 min), adsorbent doses (20, mg/100 mL). This described by high BET area 237.4 m 2 /g, XRD prominent peaks, SEM morphology corroborate FTIR multifunctionalities O–H at 3296 cm ?1 , vibration ketone C–OH 1240 C–O–C 1147 Fe–O stretching 542 . maximum Cr(IV) efficiency 91.8% recorded an concentration 40 mg/L, 3, dose mL, time min, whereas minimum 17.3% observed 20 mL dose, 9, 30 min. real determined be 85.13 mg/L its remediation found 81.8%. Langmuir’s model best fit with data R 0.99 q max 400 mg/g, showing that adsorption process homogenous monolayer. In conclusion, were encouraging, appears potential candidate Cr wastewater.